Disable SystemState

Subject: Disable SystemState
Environment: Visual Studio 2005, C#
Target: Windows Mobile 5

I have a static string defined in my application that consists of a GUID
generated by VS2005.

When my Windows Mobile application launches, I initialize my code's
BatteryLevel state:

batteryLevel = new SystemState(SystemProperty.PowerBatteryStrength);
batteryLevel.Changed += new ChangeEventHandler(ChangeOccurred);

Next, I check to see if the GUID is enabled:

if (SystemState.IsApplicationLauncherEnabled(strGuid) == true) {
batteryLevel = new SystemState(strGuid);
batteryLevel.Changed += ChangeEventHandler(ChangeOccurred);
} else {
batteryLevel.ComparisonType = StatusComparisonType.Less;
batteryLevel.ComparisonValue = BatteryState.Critical;
batteryLevel.EnableApplicationLauncher(strGuid);
}

Every time I run my code, "IsApplicationLauncherEnabled" is true.

I have tried disabling it using the Exit Menu Item's Clicked event like this:

void Exit_Clicked(object sender, EventArgs e) {
SystemState.DisableApplicationLauncher(strGuid);
}

....and like this:

void Exit_Clicked(object sender, EventArgs e) {
batteryLevel.DisableApplicationLauncher();
}

Neither version seems to disable the Application Launch condition.

I am new to these techniques, so I could be calling them incorrectly;
however, there appears to be a general lack of complete examples on the
subject that I can find on either MSDN or the rest of the Internet.

Could someone offer any advice?

Regards,
~Joe

Note: This will be cross posted in the following discussion groups:
C# Developer, and
Pocket PC Developer